Somthing wrong here, button doesn't work

I did the tutorial for open centerd popup window

http://www.kirupa.com/developer/mx/centered_popup.htm

And it works just fine on one of my sites. But when I used the same code (yes, I changed the adress to the right one :D) for another site I made… it doesent work, nothing happens. It’s like the klick function isn’t active or somthing. I just dont get it?!? The only differens is that in the one were it doesent work, the button is in a mc (the meny mc, that fades in the options of the meny). I have to guess that this is why it doesn’t work, but i dont understand why… pleas help me, tHx :smiley: